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frequency ['fri:kwənsɪ] 
词性及解释
  • n.
    频率, 频数
  • 【计】
    频率
  • 【化】
    频率; 频数
  • 【医】
    频率
  • 【经】
    频率
英英解释
  • 1.
    n.the number of observations in a given statistical category
  • 2.
    n.the ratio of the number of observations in a statistical category to the total number of observations
  • 3.
    n.the number of occurrences within a given time period
    [例]
      the frequency of modulation was 40 cycles per second
      the frequency of his seizures increased as he grew older
常用词组
例句
  • 1.
    The maximum conversion rate of most dual-slope A/D converters is limited by the frequency response of the comparator.
    双积分A/D转换器最大的转变率,限制于其比较器的频率响应。
  • 2.
    Abstract: The voltage current control system for common DC link in the full-digital-controlled AC-DC-AC frequency converter by SIEMENS is analysed , and some questions in the engineering application are sketched.
    文摘:分析了SIEMENS公司全数字交-直-交变频器公用直流母线的电压电流控制系统的组成特点和工作原理,并简述了工程应用的有关问题。
  • 3.
    Research based on combination of high frequency data with Auto-regressive Conditional Duration (ACD) Model shows that ACD model can successfully describe the intensity of bargaining arrival.
    摘要结合高频数据和自回归条件持续性(ACD)模型进行的研究表明:在中国市场,自回归条件持续性模型可以成功用来衡量交易到达的强度。
  • 4.
    This system has small volume, excellent stability, is suitable in the acme communications system and the precise precision instrument as well as the high frequency wireless transmission system and so on.
    该系统体积小、稳定性好、精度高,适用于尖端的通信系统和精密的高精度仪器以及高频无线传输系统等。
  • 5.
    The imported frequency control of motor speed adapts to different printing speeds.
    进口变频电机调速,适应不同印刷速度。
  • 6.
    ADSL transmission equipment vendors use either frequency division multiplexing or echo cancellation to achieve this huge gain in throughput.
    ADSL传输设备供应商不是利用频分多路复用,就是利用回波消除,以获得吞吐量有大幅度的提高。
  • 7.
    A set of AC power-supply circuits (usually three) carrying currents of equal frequency with uniformly-spACed phase differences
    一组频率相同,相位彼此相差均匀的交流供电电路(一般是三相)。
  • 8.
    Verify AC line voltage, phase and frequency with the controller data plate on the enclosure door prior to connecting AC power.
    在连接交流电源之前,请验证交流电压、相位和频率是否与控制装置外壳门参数板上的相应数据相同。
  • 9.
    The mask ACTS as a low frequency spatial filter whose effect is to enhance rendition of fine detail
    掩模就象一个低频空间滤波器,其效果是增强细节的重现。
  • 10.
    The AGC unit sends signals to the generating units under its control to raise or lower load as required to correct frequency and tie-line loadings.
    AGC控制单元送出信号至受其控制的发电机组,按标准频率和联络线负荷的要求来增大和减少负荷。
词汇级别

小测验:选择正确的单词

ad. 频繁, 经常地
  • A.fdresh
  • B.fdrequent
  • C.fdrequently
  • D.fdresco

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